Flash Mp3 player shows NaN:NaN before counter starts

Hello I have flash Mp3 player that displays the accumulated minutes and seconds of the song playing. But before a song starts ,when the flash file is first loaded, the counter shows up as NaN:NaN.

I placed an if statement to check if the secs are less than 0, if so then make the counter 00:00. It worked but stayed there even after the song begins.

Please help.
The counter is in a symbol and is in an onEnterFrame function.

Thanks in advance!